End wall of moldable material for a wound roll

Abstract

An end wall comprises a central wall body and outer wall parts which surround and enclose the central wall part. The central wall body is of circular design and has a central insertion peg which is provided with V-shaped ridges on its peripheral surface. The outer wall parts have an inward-curving quadrant-shaped abutment surface which has the same radius as the central wall body. On the rear side of the composite plate, junctions are provided along the abutment surfaces of the outer wall parts and of the central wall body, into which junctions connecting pieces are driven. The junctions and the connecting pieces in each case have the outline of double swallowtail. At its front side, each outer wall part is provided with a locking boss which continues a rounded corner surface and has the same radius as this corner surface. The side walls of the plates are either of smooth design or provided with stacking bosses and stacking pockets.

What is claimed is: 
     
       1. An end wall of moldable material for a wound roll comprising a central wall body and a plurality of outer wall parts adjacently contacting the circumferential surface of said central wall body, wherein said central wall body and outer wall parts form a rectangular plate comprising a front side facing said roll, a rear side facing outward, and a plurality of rounded corner surfaces, wherein said front side comprises a smooth flat surface, a central insertion plug and a plurality of locking bosses, and said rear side comprises a plurality of radial and annular ribs, whereby said rear side is stiffened. 
     
     
       2. The end wall as claimed in claim 1, wherein said central wall body is circular and bounded along its circumferential surface by four said outer wall parts and is non-releasably connected to said parts by a plurality of connecting pieces. 
     
     
       3. The end wall as claimed in claim 2, wherein said central wall body comprises said central insertion peg, which is hollow and cylindrical and is connected via a shoulder to a central cylindrical through-opening on the rear side of said plate, and wherein the diameter of said through-opening is greater than the outside diameter of said insertion peg. 
     
     
       4. The end wall as claimed in claim 3, wherein a plurality of V-shaped ridges extend parallel to the longitudinal axis of said insertion peg on the outer surface of said insertion peg, said ridges having a V-shaped cross-section which becomes smaller towards the front side of said plate. 
     
     
       5. The end wall as claimed in claim 2, wherein each of said outer wall parts has a rounded corner surface and a cylindrical locking boss which is integrated with and has the same radius as said rounded corner surface, wherein an inward-curving, quadrant-shaped abutment surface which adjoins said central wall body lies diagonally opposite said corner surface and has the same radius as said central wall body and wherein in each case one flat abutment surface, which rests against an adjoining outer wall part, starts from the two corner edges of said quadrant-shaped abutment surface, the two flat abutment surfaces extending at right angles to one another and each abutment surface enclosing a right angle with an adjoining side wall of said outer wall part. 
     
     
       6. The end wall as claimed in claim 2, wherein said connecting pieces are reinforced by internal webs between the circumferential walls of said pieces, and wherein, at the longitudinal outer sides of said circumferential walls a boss is arranged on each of a plurality of tabs which are bounded on each side by a slot, allowing said tabs to execute a spring action with respect to said circumferential walls. 
     
     
       7. The end wall as claimed in claim 6, wherein, on said rear side, the circumferential surface of said central wall body comprises a plurality of recesses each of which is provided with a plurality of openings in its longitudinal wall for acceptance of said bosses of one of said connecting pieces, and said inward-curving, quadrant-shaped abutment surface and said two abutment surfaces of each said outer wall part comprises a recess which is provided with a plurality of openings in its longitudinal wall for the acceptance of said bosses of one of said connecting pieces. 
     
     
       8. The end wall as claimed in claim 7, wherein said recesses in the circumferential surface of said central wall body and in said abutment surfaces are swallowtail-shaped, and wherein the mutually opposed, equal-sized recesses in the abutment surfaces of said outer wall parts and the mutually opposed, equal-sized recesses in the quadrant-shaped abutment surface of said outer wall parts and the circumferential surface of said central wall body form the outline of a double swallowtail. 
     
     
       9. The end wall as claimed in claim 6, wherein said connecting pieces have a double swallowtail-shaped outline. 
     
     
       10. The end wall as claimed in claim 1, wherein a plurality of stacking bosses which limit a plurality of stacking pockets are provided on the two outer side walls of each said outer wall part of said end wall, and wherein said stacking pockets are of complementary design to said stacking bosses. 
     
     
       11. The end wall as claimed in claim 10, wherein said stacking bosses have different lengths and bevelled side faces which are inclined towards said side wall, and wherein pairs of stacking bosses lie flush with the upper and the lower edge of said side wall. 
     
     
       12. The end wall as claimed in claim 11, wherein said stacking bosses have additional oblique surfaces (27, 28), wherein one short stacking boss (21) is disposed adjacent said rounded corner and another short stacking boss is disposed adjacent said flat abutment surface on the side wall of said outer wall part, said two short stacking bosses being rotated by 180° with respect to one another and lying flush with the upper and lower edge respectively of said side wall, and wherein two longer stacking bosses are disposed between said short stacking bosses, are rotated by 180° with respect to one another and are offset with respect to one another such that their diagonally opposing oblique surfaces overlap. 
     
     
       13. The end wall as claimed in claim 12, wherein the mutually opposing, spaced end faces of said stacking bosses extend perpendicularly on said side wall, to form a guide groove for a strap of said wound roll. 
     
     
       14. The end wall as claimed in claim 5, wherein the locking boss of each said outer wall part has a cylindrical boss neck which is set off by a shoulder and is of smaller diameter than said locking boss. 
     
     
       15. The end wall as claimed in claim 14, wherein said locking boss is hollow and cylindrical and, on the rear side of said outer wall part merges into a recess which is surrounded by said rounded corner surface and a round web. 
     
     
       16. The end wall as claimed in claim 1, wherein said plate is square.